In 1972, the composer Leonard Bernstein returned to Harvard, his alma mater, to serve as the Charles Eliot Norton Professor of Poetry, with “Poetry” being defined in the broadest sense. The position, first created in 1925, asks faculty members to live on campus, advise students, and most importantly, deliver a series of six public lectures. T.S. Eliot, Aaron Copland, W.H. Auden, e.e. cummings, Robert Frost, Jorge Luis Borges — they all previously took part in this tradition. And Bernstein did too.